Analysis of the Cause of Cracks of MB15 Die Forging
[Purposes]During the assembly riveting process of MB15 die forging,it was found that visible cracks appeared along the longitudinal and near the riveting hole.The cracks were straight,and multiple cracks appeared in local positions.Therefore,it is urgent to find out the cause of cracks.[Methods]Through macroscopic observation,microscopic observation,energy spectrum analysis,metallographic ex-amination and hardness test,chemical composition analysis,the cracking properties and causes of the crack were discussed.[Findings]The results show that the cracking property of the crack is intergranular brittle cracking,the crack occurs in the forging stage,the incomplete recrystallization at the crack site is related to the lower forging deformation temperature.[Conclusions]It is suggested to strictly control the forging process of magnesium forgings,strictly control the deformation temperature,deformation rate and other conditions,and increase the testing process of parts before leaving the factory,so as to decrease the cracking problem of parts and improve the supply quality.
MB15castingrecrystallzationdeformation temperature
万方数据
维普
